Method of resiliently mounting a roll on a shaft



Oct 5, 1948- F. HAUSHALTER METHOD OF RESILIENTLY MOUNTING A ROLL 0N ASHAFT Filed Jan. 22, 1946 IN VEN TOR.

F251: L. /A usf-(ALTER Q Q. x www fadl ,/f MKII l Q Q Y Q Patented Oct.5, 1948 UNITED STATES PATENT oFFlcE ROLL N A SHAFT l Fred L.Beinhaltet,` Pontiac, Mich. Application January 22, 1946, Serial No.642,684

4 claims. (cl. 29-14s.4)

place, or by cementing the shaft to the core.

An object of the present invention is to provide a method for making arubber covered cushion roll in which the inner core will be held firmlyin place within the outer tube and in which the shaft will be heldfirmly in place within the inner core without the need for curing thematerial or cementing the shaft to the material.

In the drawings, Fig. 1 is a longitudinal crosseither by curing therubber with the shaft in The outer cylinder, shown in Flg. 2 hassubstantially the length, outerl diameter, hardnessl and resiliencydesired for the finished platen or roll. The inner diameter A isnormally smaller than the original diameter A of the tube I3, but asaforesaid is larger than the diameter B. Thus the outer cylinder may beslipped axially over the stretched inner cylinder to a position near thesupport, as is shown in Fig. 4. The rod I2 may then be withdrawn and theinner cylinder is thereby'contracted in length, and in doing so isexpanded in diameter and is forced into gripping engagement with the endsurface of the inner cylinder. In this manner the stress is uniformlydistributed through the tube. The fastenings I4 and I5 are thenYreleased and removed, the composite tubing is removed from the rod, anda trimming operation is performed to make the ends of the two cylindersflush and to the desectional view illustrating an inner sleeve mountedupon a stretching apparatus and before the stretching operation; Fig. 2is a longitudinal section through the outer cylinder; Fig. 3 is a viewsimilar to Figs. 1 and 2, but illustrating a further step in which theinner sleeve have been stretched and the outer cylinder vis about to beplaced thereover; Fig. i illustrates the parts after the inner sleevehas been allowed to contract; Fig. 5 illustrates the shaft being pressedthrough the assembled inner and outer sleeves, the broken linesrepresenting the finished article; Fig. 6 is a. sectional view similarto Fig. l, but showing the shaft of the nal assembly being used forstretching the sleeve, and Fig. 7 shows the shaft and sleeve of'Fig.. 6forced into the outer sleeve.

In Figs. 1 to 5, I have shown one method of performing the invention andalso' the finished article resulting therefrom. Thus, in Fig. 1 asupport I0 carries a fixed sleeve Il whichin turn slidably carries a rodI2. One end of an inner vtube o'r sleeve I3 of an appropriate soft andresilient material is bound to the sleeve II as by a band I4. The otherend of the tube is bound to the rod as by a band I5. Referring to Fig.3, it will be seen that as the rod I2 is driven to the right by a powermeans (not shown) the tube is stretched and elongated. 'I'he elongationis accompanied by a reduction in wall thickness and in the outerdiameter o f the tube, and the elongation is continued until thediameter A of the unstretched tube in Fig. 1 is reduced to the diameterB (Fig. 3), which is smaller than the diameter C of the tube Il.

sired length.

In the method of Figs. 1 to 5 a finished platen shaft II is then forcedaxially through the composite tube to the nal position illustrated inbroken lines at I8. The various diameters of the tubes are so designedthat the resulting inner diameter of the confined inner tube is smallerthan that of the shaft, whereby the inner cylinder is securely heldagainst the outer cylinder and against the shaft solely by the radialreaction of the inner cylinder.

In Figs. 6 and 7 are shown a modified form of making the assembly inwhich the tube I3A has a leading end thereof bound by a wire band ISA tomake a restricted neck beyond the leading end of the shaft I'IA. Suchshaftmay be the finished shaft, and the shaft thereby acts as a ram tomove the inner sleeve axially into the outer sleeve, as shown in Fig. 7.In such modification, the outer diameter of the sleeve I3A is Agreaterthan the inner diameter ofthe cylinder IGA, whereby the rubber-likematerial of the inner sleeve is elongated as it becomes reduced indiameter during its progress axially through the outer sleeve, and isthus placed under radial compression uniformly throughout its length soas to adhere firmly not only to the outer cylinder, but also to theshaft, whereby a firm bond is made without the need for vulcanization orthe use of cement. At the completion of the operation shown in Fig. '1,the inner sleeve is trimmed off ush with the ends of the outer sleeveand the device is ready for use.

An advantage of the present invention is the fact that the resultingroll may have a relatively hard outersurface and a relatively soft innersurface without the necessity either for a vuicanizing or cementingoperation. The method of manufacture assures an even distribution ofstress of the stretched material, and thereby achieves a satisfactoryresult in a simple and expeditious mannen I claim:

1. A method of making a roll comprising binding one end of a resilienttube on a hollow support, binding the other end on a member projectingthrough the support and tube, forcibly protruding the member fartherfrom the support to elongate the tube and reduce its diameter,telescoping a second resilient tube over the first tube, retracting themember to allow the first tube to expand in diameter to grip the secondtube, trimming the first tube to cause its end to be flush with the endof the second tube, and pressing a shaft axially through such mountedfirst tube until it projects beyond the opposite ends of the tubes,whereby a shaft suitable for mounting in bearings is drivingly connectedto the second tube through the intermediacy of the first tube.

2. The method of making a roll having acomparatively hard resilientexterior cushioned on a shaft adapted tc be mounted in bearings at eachend of the roll comprising taking a tube of comparatively hard resilientmaterial, taking a shaft materially longer than the tube and having adiameter materially less than the interior diameter of this tube,putting said shaft within a tube of comparatively soft resilientmaterial which is restricted at its front end across the leading end ofthe shaft, the exterior of said comparatively soft tube being thengreater than the interior diameter of the comparatively hard tube, thenforcing the covered shaft axially forward into thev harder tube untilthe shaft extends beyond each 4 ming of! the excess ofthe inner tubeabout the leading end of the shaft flush with the corresponding end ofthe outer tube.

3. The method of making a roll comprising stretching a tube of resilientmaterial to an increased length and decreased outer diameter.telescoping a second tube of harder material over the first tube,allowing the first tube to contract in length and thereby to expand indiameter and grip the second tube, and pressing a shaft axially throughthe first tube in snug engagement with the interior thereof until theshaft projects beyond each end of such tube, whereby'a shaft suitablefor mounting in bearings is drivingly connected to the second tubethrough the intermediacy of the first tube.

4. The method of making a roll comprising stretching a tube of resilientmaterial to an increased length and decreased outer diameter,telescoping a second tube of harder material over the first tube,trimming the first tube flush with the ends of the second tube, andwhile the tubes are thus mutually mounted pressing a shaft axiallythrough the first tube until it projects beyond each end of such tube.`

FRED L. HAUSHALTER.

REFERENCES CITED The following references are of record in the

